WindowsWorkflowFoundation (WF) is one of the parts of the .NET 3.0 framework as released by Microsoft. One of the most interesting aspects of WindowsWorkflowFoundation (WF) is the separation between business process code and the actual implementation, often a requirement in ServiceOrientedArchitecture (SOA). Before WindowsWorkflowFoundation the typical scenario would be to write both the business logic and the actual implementation in CSharp (C#), VisualBasic .NET or another .NET language. The result was no clear separation between business logic and its implementation. With the release of Windows Workflow Foundation (WF) the business logic can be defined in the workflow while the actual underlying implementation is done in C#, Visual Basic .NET or another .NET language. So basically the what is done in the workflow and the how is done in traditional programming code.